PRESSURE RESISTANT LIFE TESTING APPARATUS FOR PRESSURE VESSEL

PROBLEM TO BE SOLVED: To efficiently obtain fatigue strength characteristics or the like of a pressure vessel from a small number of results in a short time by executing a pressure resistant life test of the vessel by casting according to a schedule. SOLUTION: Target test lives Nfx of short and long life ranges and a pressure-to-stress ratio Δσ/ΔP intrinsic to a site to be evaluated for a strength of the pressure vessel are input as numeric values by an input unit 11. And, casting fault distribution characteristics and fatigue strength characteristics are read from a characteristic memory 13, and change pressures ΔP corresponding to the lives Nfx of the short and long life ranges are obtained by a pressure calculator 12. A pressure pattern corresponding to the pressure ΔP is generated from a pressure pattern generator 15 of an inspection apparatus 14. And, the breakage of the vessel is detected in an inspection testing tank 16. A strength evaluating unit 29 evaluates a strength of the vessel from test results of the vessel in the short and long life ranges by the apparatus 14.